Rework completion interfaces

- Use same interface type in a generic interactive completions
  in a method level and option value level.
- Change CompletionResolver to have same function signature
  as with options and use CompletionContext to keep
  relevant information.
- Fixes #449

spring-shell-autoconfigure/src/main/java/org/springframework/shell/boot/ParameterResolverAutoConfiguration.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.springframework.shell.boot;
 
 import java.util.ArrayList;
@@ -11,7 +26,7 @@ import org.springframework.shell.command.ArgumentHeaderMethodArgumentResolver;
 import org.springframework.shell.command.CommandContextMethodArgumentResolver;
 import org.springframework.shell.command.CommandExecution.CommandExecutionHandlerMethodArgumentResolvers;
 import org.springframework.shell.completion.CompletionResolver;
-import org.springframework.shell.completion.DefaultCompletionResolver;
+import org.springframework.shell.completion.RegistrationOptionsCompletionResolver;
 import org.springframework.shell.config.ShellConversionServiceSupplier;
 import org.springframework.shell.standard.ShellOptionMethodArgumentResolver;
 
@@ -20,7 +35,7 @@ public class ParameterResolverAutoConfiguration {
 
 	@Bean
 	public CompletionResolver defaultCompletionResolver() {
-		return new DefaultCompletionResolver();
+		return new RegistrationOptionsCompletionResolver();
 	}
 
 	@Bean